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Home >> Toyota >> 2004 >> Matrix Base, FWD, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 111 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P2120, DTC P2122, DTC P2123, DTC P2125, DTC P2127, DTC P2128 Or DTC P2138 >> Diagnosis & Repair (Using OBD-II Scan Tool)
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Diagnosis & Repair (Using OBD-II Scan Tool)

WARNING: This page is about a different car, the 2003 Lexus SC 430. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disconnect the accelerator pedal position sensor connector. Measure the resistance between the terminals of the accelerator pedal position sensor. See ACCELERATOR PEDAL POSITION SENSOR RESISTANCE  table. See Figure. If resistance is to specification, go to next step. If resistance is not to specification, replace accelerator pedal rod assembly.
  2. Disconnect the A14 accelerator pedal position sensor 6-pin connector. See Figure. Disconnect the ECM E5 connector. Check the continuity between the wire harness side connectors. See ACCELERATOR PEDAL POSITION SENSOR/ECM CONTINUITY CHECK  table. See Figure. If continuity is to specification, go to next step. If continuity is not to specification, repair or replace harness or connector as necessary.
  3. Turn the ignition switch ON. Measure the voltage between the terminals of the ECM E5 connector. See VPA & VPA2 VOLTAGE CHECK  table. See Figure. If voltage is to specification, go to next step. If voltage is not to specification, replace ECM.
  4. Disconnect the A14 accelerator pedal position sensor 6-pin connector. See Figure. Disconnect the ECM E5 connector. Check the continuity between the wire harness side connectors. See ACCELERATOR PEDAL POSITION SENSOR/ECM CONTINUITY CHECK  table. See Figure. If continuity is to specification, replace ECM. If continuity is not to specification, repair or replace harness or connector as necessary.
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